Thin profile surface mount lighting apparatus

ABSTRACT

An LED downlighting apparatus includes a housing with a sidewall having a front facing edge and a back facing edge positioned adjacent to a ceiling when the LED downlighting apparatus is installed in an opening of the ceiling. A depth of the sidewall is less than one inch and a thickness of at least a portion of the sidewall is less than three millimeters. An LED board and a lens are coupled to the housing. The lens is disposed with respect to the LED board such that the lens is illuminated from a back side. One or more mechanical couplers snap fit the apparatus to a junction box installed and positioned above the ceiling such that when the apparatus is snap fit to the junction box through the opening of the ceiling, the housing appears to be surface mounted to the ceiling.

CROSS-REFERENCES TO RELATED APPLICATIONS

The present application is a continuation application of U.S. application Ser. No. 16/653,497, filed Oct. 15, 2019, and entitled, “Thin Profile Surface Mount Lighting Apparatus,” which claims priority to U.S. application Ser. No. 16/016,040, filed Jun. 22, 2018, and entitled, “Thin Profile Surface Mount Lighting Apparatus,” which claims the benefit, under 35 U.S.C. § 119(e), of U.S. provisional application Ser. No. 62/523,640, filed Jun. 22, 2017, entitled “Surface Mounted Ceiling Lamp,” and U.S. provisional application Ser. No. 62/552,126, filed Aug. 30, 2017, entitled “Surface Mounted Ceiling Lamp.” The present application also claims the benefit, under 35 U.S.C. § 120, as a continuation-in-part (CIP) of U.S. design application Ser. No. 29/648,046, filed May 17, 2018, entitled “Light Fixture.” Each of the aforementioned applications is incorporated by reference herein in its entirety.

BACKGROUND

Some conventional surface mount LED downlights may be coupled to a junction box disposed behind a ceiling and may be employed in new construction or retrofit architectural projects. One such example is the “Disk Light” provided by Commercial Electric and manufactured by Cree (manufacturer model number CE-JB6-650L-27K-E26). The Disk Light can be installed in an existing recessed can or a four-inch junction box and includes a semi recessed lens. The Commercial Electric Disk Light may be used indoors and in an outdoor enclosed setting, and is generally intended for kitchens, hallways, bathrooms, closets, laundry, porches and garage work rooms. Another example is the Halo Surface Mount LED Downlight (SMD) series, which are low-profile surface mount luminaires designed for installation in many 3½″ and 4″ square, octagon, or round junction boxes.

SUMMARY

Various inventive concepts disclosed herein relate generally to a thin surface mount type of luminaire, wherein “thin” refers to the protruding portion of the luminaire below the line of the ceiling, for example. In various implementations, the luminaire can be installed from below the ceiling by a twist lock mechanism or by clips into a junction box that is installed in the ceiling. Some implementations include a test switch that is accessible from the portion of the luminaire that protrudes below the ceiling line. The lens of some implementations combines a total internal reflection lens with a conical structure buried at its center. In other implementations, the luminaire includes a plurality of light sources distributed evenly across a light producing portion of the luminaire. In such implementations, the light sources can comprise LEDs.

In sum, one inventive implementation is directed to an LED lighting apparatus, comprising: a housing comprising at least one sidewall having a front facing edge and a back facing edge positioned adjacent to a ceiling when the LED lighting apparatus is installed in an opening of the ceiling, wherein a depth of the at least one sidewall of the housing, between the front facing edge and the back facing edge, is less than one inch such that the apparatus does not visibly appear to protrude substantially from a surface of the ceiling when the apparatus is installed in the opening of the ceiling; an LED board coupled to the housing, the LED board comprising a plurality of LEDs; and a lens coupled to the housing, the lens having a back side facing the LED board and a front side opposite to the back side, wherein the front side of the lens provides a downward facing surface when the LED lighting apparatus is installed in the opening of the ceiling, the lens being disposed with respect to the LED board such that the plurality of the LEDs illuminate the back side of the lens. A first spacing of the plurality of the LEDs on the LED board causes resulting light from the downward facing surface of the lens to be substantially uniform during operation of the apparatus. The front side of the lens, providing the downward facing surface when the LED lighting apparatus is installed in the opening in the ceiling, is essentially flush with the front facing edge of the at least one sidewall of the housing.

Another inventive implementation is directed to an LED lighting apparatus, comprising: a housing; an LED board coupled to the housing, the LED board comprising a plurality of LEDs; and a lens coupled to the housing, the lens having a back side facing the LED board and a front side opposite to the back side, wherein the front side of the lens provides a downward facing surface when the LED lighting apparatus is installed in an opening of a ceiling, the lens being disposed with respect to the LED board such that the plurality of the LEDs illuminate the back side of the lens. A first spacing of the plurality of the LEDs on the LED board causes resulting light from the downward facing surface of the lens to be substantially uniform during operation of the apparatus.

Another inventive implementation is directed to a thin profile surface mount LED lighting apparatus, comprising: a housing comprising at least one sidewall having a front facing edge and a back facing edge positioned adjacent to a ceiling when the LED lighting apparatus is installed in an opening of the ceiling, wherein a depth of the at least one sidewall of the housing, between the front facing edge and the back facing edge, is less than one inch; an LED board coupled to the housing, the LED board comprising a plurality of LEDs; and a lens coupled to the housing, the lens having a back side facing the LED board, a front side opposite to the back side and an outer edge, wherein the front side of the lens provides a downward facing surface when the LED lighting apparatus is installed in the opening of the ceiling, the lens being disposed with respect to the LED board such that the plurality of the LEDs illuminate the back side of the lens. The front facing edge of the at least one sidewall forms a perimeter around the outer edge of the lens. The front side of the lens, providing the downward facing surface when the LED lighting apparatus is installed in the opening in the ceiling, is essentially flush with the front facing edge of the at least one sidewall of the housing forming the perimeter around the outer edge of the lens. The perimeter around the outer edge of the lens is significantly thin so as not to extend significantly beyond the outer edge of the lens.

It should be appreciated that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (provided such concepts are not mutually inconsistent) are contemplated as being part of the inventive subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing at the end of this disclosure are contemplated as being part of the inventive subject matter disclosed herein. It should also be appreciated that terminology explicitly employed herein that also may appear in any disclosure incorporated by reference should be accorded a meaning most consistent with the particular concepts disclosed herein.

BRIEF DESCRIPTION OF THE DRAWINGS

The skilled artisan will understand that the drawings primarily are for illustrative purposes and are not intended to limit the scope of the inventive subject matter described herein. The drawings are not necessarily to scale; in some instances, various aspects of the inventive subject matter disclosed herein may be shown exaggerated or enlarged in the drawings to facilitate an understanding of different features. In the drawings, like reference characters generally refer to like features (e.g., functionally similar and/or structurally similar elements).

FIG. 1 is an assembly drawing of an example luminaire according to some inventive implementations.

FIGS. 2A, 2B, and 2C illustrate various aspects of a lens in the assembly of FIG. 1, according to some inventive implementations.

FIGS. 3A and 3B illustrate various aspects of a conical structure of the lens of FIGS. 2A through 2C, according to some inventive implementations.

FIGS. 4A and 4B illustrate aspects of mounting a luminaire in a junction box, according to some inventive implementations.

FIG. 5 is an assembly drawing of another example luminaire according to some inventive implementations.

FIG. 6 illustrates various emergency aspects of the example luminaire of FIG. 5 according to some inventive implementations.

FIG. 7 is an assembly drawing of another example luminaire according to some implementations.

FIG. 8A illustrates an example circular LED board that can be included in a luminaire such as that illustrated in FIG. 7, according to some inventive implementations.

FIG. 8B illustrates an example rectangular LED board that can be included in a luminaire according to some inventive implementations.

FIGS. 9A and 9B illustrate example aspects of installing a luminaire such as that shown in FIG. 7 into a junction box in a ceiling, according to some inventive implementations.

FIG. 9C is a partial side cross-sectional view of the luminaire of FIG. 7, illustrating an arrangement of an LED board and a lens disposed in a housing and example dimensions relating to same, according to some inventive implementations.

FIG. 10A is a side view of a luminaire similar to that shown in FIG. 7, according to some inventive implementations.

FIG. 10B is a front view (or downward facing view) of the luminaire shown in FIG. 10A.

FIG. 10C is a back view (or upward facing view) of the luminaire shown in FIG. 10A.

FIG. 10D is a back (or top) perspective view of the luminaire shown in FIG. 10A.

FIG. 10E is a front (or bottom) exploded perspective view of the luminaire shown in FIG. 10A.

FIG. 11A is a side view of a luminaire similar to that shown in FIG. 7, according to some inventive implementations, which includes a test button similar to that shown in FIG. 5.

FIG. 11B is a front view (or downward facing view) of the luminaire shown in FIG. 11A.

FIG. 11C is a back view (or upward facing view) of the luminaire shown in FIG. 11A.

FIG. 11D is a back (or top) perspective view of the luminaire shown in FIG. 11A.

FIG. 11E is a front (or bottom) exploded perspective view of the luminaire shown in FIG. 11A.

FIG. 12A is a front (or bottom) side perspective view of a rectangular-shaped luminaire according to some inventive implementations.

FIG. 12B is a back (or top) side perspective view of the luminaire of FIG. 12A according to some inventive implementations.

DETAILED DESCRIPTION

Following below are more detailed descriptions of various concepts related to, and implementations of, inventive thin profile surface mount lighting apparatus. It should be appreciated that various concepts introduced above and discussed in greater detail below may be implemented in numerous ways. Examples of specific implementations and applications are provided primarily for illustrative purposes so as to enable those skilled in the art to practice the implementations and alternatives apparent to those skilled in the art.

The figures and examples below are not meant to limit the scope of the present implementations to a single embodiment, but other implementations are possible by way of interchange of some or all of the described or illustrated elements. Moreover, where certain elements of the present implementations can be partially or fully implemented using known components, only those portions of such known components that are necessary for an understanding of the present implementations are described, and detailed descriptions of other portions of such known components are omitted so as not to obscure the present implementations. In the present specification, an implementation showing a singular component should not be considered limiting; rather, the present disclosure is intended to encompass other implementations including a plurality of the same component, and vice-versa, unless explicitly stated otherwise herein. Moreover, applicants do not intend for any term in the specification or claims to be ascribed an uncommon or special meaning unless explicitly set forth as such.

According to certain aspects, the present applicants have recognized that it would be desirable to have a low cost but aesthetically pleasing and efficient LED downlight that is, or appears to be, surface mounted to a ceiling, and which includes a thin profile and uniform lighting distribution.

In fulfillment of these and other aspects, FIG. 1 is an assembly drawing of an example luminaire according to some implementations.

As shown, luminaire 100 is comprised of a housing 102 having an integrally formed flange portion 116 and fins 122. As further shown, luminaire 100 also includes driver 104, reflector 106, lens 108, cone 110, light source 112 and adapter bracket 114. As will be described in more detail below, the luminaire 100 is designed to be positioned behind a ceiling or a wall such that the flange portion 116 of housing 102 extends outside a hole in the ceiling or wall (not shown) and rests flush against the exposed surface of the ceiling or wall. As such, the flange portion 116, when assembled together with lens 108, helps the luminaire 100 appear to be “surface-mounted” on the ceiling or wall, although it is not actually mounted on the surface.

The driver 104, as will be described below in more detail below, is mounted within driver module cover 124 and contained inside the housing 102 behind reflector 106, lens 108 and cone 110. The lens 108 is attached to the flange portion 116 by a twist and lock mechanism built into the outer periphery of lens 108 and inner surface of flange portion 116 as will be described in more detail below. The lens 108 thus completely fills the opening defined by flange portion 116, and thus further helps the luminaire 100 appear to be mounted on the surface of the ceiling or wall. Despite these appearances however, the luminaire is not designed to be directly mounted to the surface of the ceiling or wall. Rather, the adapter bracket 114 allows the luminaire 100 to be installed within a junction box (not shown, for example via a twist and lock mechanism or a friction fit mechanism), the junction box being already installed within the ceiling or wall as described in more detail below. The housing 102 can be secured to bracket 114 by screws 118 and clips 120.

Housing 102, including integrally formed flange portion 116 and fins 122, may be composed of any thermally conductive material so as to help cool the luminaire during operation of light source 112. For example, housing 102 including integrally formed flange portion 116 and fins 122 may be comprised of injection molded thermally conductive plastic. In other implementations, housing 102, flange portion 116 and/or fins 122 may be made of aluminum alloys, copper, copper-tungsten pseudoalloy, AlSiC (silicon carbide in aluminum matrix), Dymalloy (diamond in copper-silver alloy matrix), E-Material (beryllium oxide in beryllium matrix), and/or other thermally conductive plastics or ceramics.

Driver 104 is an electronic circuit or device that supplies and/or regulates electrical energy to the light source 112 and thus powers the light source 112 to emit light. The driver 104 may be any type of power supply circuit, including one that includes power converters, rectifiers, power transistors and the like for delivering an appropriate alternating current (AC) or a direct current (DC) voltage to the light source 112. Upon receiving electricity, the driver 104 may regulate current or voltage to supply a stable voltage or current within the operating parameters of the light source 112. In implementations, the driver 104 receives an input current from an electrical power wiring network of the building or structure in which the luminaire 100 is installed and may drop the voltage of the input current to an acceptable level for the light source 112 (e.g., from 120V-277V to 36V-48V). In these and other implementations, ground wire 130, attached to housing 102 by screw 132, is electrically connected to the electrical power ground and wires 135 are electrically connected to a wiring network (e.g., the main house voltage of a building or other transformed voltage) and delivers power to the driver 104.

The light source 112 may be any electro-optical device or combination of devices for emitting light. For example, the light source 112 may have one or more light emitting diodes (LEDs, such as an XLamp LED from Cree), organic light-emitting diode (OLEDs), or polymer light-emitting diode (PLEDs). The light source 112 receives electricity from the driver 104, as described above, such that the light source 112 can emit a controlled beam of light toward cone 110 and lens 108, and thus into a room or surrounding area of the luminaire 100 (when installed behind a ceiling or wall) as will be described in more detail below.

Driver module cover 124 in implementations may be made of heat resistant or insulating plastic, for example plastic comprising materials selected from a group consisting of semi-crystalline polyamides, polyamide alloys, polycarbonate, polymers, minerals, glass, carbon, steel fibers, etc. In these and other implementations, insulator 124 may be formed by injection molding, extrusion or other means and dimensioned in accordance with driver 104, which is held into place inside insulator 124 via clips 126. In the illustrated embodiment, driver module cover 124 is attached to housing 102 by screws 128, which in turn aligns light source 112 with an opening in reflector 106 and thus an optical path between light source 112, lens 108 and cone 110 as will become more apparent from the descriptions below.

Example aspects of lens 108 and cone 110 according to implementations are shown in FIGS. 2A and 2B which provide side and cross-sectional views, respectively. FIG. 2C also provides a cross-sectional view of aspects of an operation of lens 108 and cone 110 together with light source 112 and reflector 106 when assembled and aligned together as designed. As shown in FIGS. 2A and 2B, the lens according to the present implementations is unusual. When assembled for operation according to implementations, it combines a total internal reflection lens 108 with a reflective conical structure 110 buried at its center. In implementations, cone 110 is sized and dimensioned to be held into place in a corresponding center depression 204 of lens 108 with a friction fit. In other implementations, cone 110 is held into place by an adhesive or other suitable means. In still other implementations, lens 108 and cone 110 are integrally formed together from a single unitary material, with the upper surface of cone 110 being machined or otherwise formed in the center of lens 108.

As further shown in FIG. 2C, according to operational aspects of an assembled luminaire 100, the light from light source 112 is projected toward the center of the lens and is mostly reflected by the cone 110 into the lens 108. From there it undergoes further total internal reflections within the lens forcing the light to travel downwards and out the exit side of the lens 108. Under normal conditions, the spot on the lens covered by the cone 110 would be dark because all the light would be reflected. According to the present implementations, however, the reflective surface of the cone 110 is not completely reflective. Rather, it is configured to allow about 10% of the light to pass through as will be described in more detail below. This prevents a dark spot from appearing at the exit side of lens 108 in the center portion occupied by the cone 110. It should be further noted that the total internal reflection features of lens 108 and the partially transmissive features of cone 110 allows for a uniform amount of light to be distributed across the entire surface of the exit side of lens 108, which starkly contrasts with conventional approaches, such as those having light sources arranged at a periphery of a lens. Still further, the arrangement of lens 108 and cone 110 allow for the use of only a single light source 112, which enables a low-cost design as opposed to other approaches requiring multiple light sources.

According to further aspects of some implementations, when assembled for operation together with reflector 106, any light from light source 112 that is reflected by cone 110 but which escapes from lens 108 back toward light source 112 is further reflected downward and back out the exit side of lens 108, thus increasing the operational lighting efficiency of light source 112.

Lens 108 may be made of any optically transmissive material, including glass and hard plastics. For example, lens 108 may be comprised of polycarbonate material. In one embodiment, the lens 108 also provides a protective barrier for the light source 112 and shields the light source 112 from moisture or inclement weather. As further shown in FIG. 2A, an embodiment of lens 108 includes twist and lock groove 202 formed on the outer periphery of lens 108. As such, lens 108 may be sized and shaped to be locked into position into flange portion 116 of housing 102, thereby covering the main opening at the bottom of the housing 102 and providing the shielding advantages as mentioned above. Moreover, the twist and lock mechanism allows for lens 108 to be removed from below a ceiling even when the luminaire 100 is installed, thereby allowing for components of luminaire 100 to be accessed for test, inspection, removal, replacement, etc., without having to remove the luminaire 100 from behind the ceiling or wall.

Reflector 106 may be made of any reflective material, or any material having a reflective coating. In implementations, reflector 106 is comprised of highly reflective (e.g. 98%) Valar 2.0 BRDF. In these and other implementations, reflector 106 is separately formed from lens 108 and held into place within housing 102 when lens 108 is twist and locked into flange portion 116.

FIGS. 3A and 3B illustrate example aspects of cone 110 according to implementations in more detail, providing top and cross-sectional views of cone 110, respectively.

In the illustrated implementations, cone 110 is made of a thermoplastic material such as polycarbonate, having a base portion 302 and cone portion 304. As shown, cone portion 304 is formed so as to extend at an angle of about 45 degrees from base portion 302. Cone 110 includes bottom surface 306, side surface 308 and cone surface 310. With reference to FIG. 2, when assembled together with lens 108, the bottom surface 306 abuts with a bottom portion of depression 204 in lens 108, while side surface abuts with a side portion of depression 204 in lens 108. In implementations, cone surface 310 is treated to cause light from light source 112 to reflect towards and into lens 108, while allowing some light to enter cone 110 and exit through bottom surface 306. Accordingly, bottom surface 306 is preferably treated in these and other implementations to allow for light to be transmitted through surface 306 and toward an exit side of lens 108. In non-limiting example implementations, cone surface 310 is vacuum metalized (e.g. aluminum) to be 90% reflective and 10% transmissive, and possibly further coated with a coating such as SiO, SiO2 or organic coatings having silicates. In these and other implementations, surface 306 and surface 308 are both surface treated with a texturing specification such as LDK-1002, however such texturing is not necessary in all implementations.

FIG. 4A illustrates aspects of how the present implementations provide aesthetically pleasing surface mounted appearances when luminaire 100 is used as a downlight in a ceiling.

Housing 102 is secured to junction box 402 via adapter 114 and a corresponding adapter ring 416, as will be described in more detail below. Junction box 402 is mounted above an opening of ceiling 404 and can be secured to a ceiling by two or more hanger arms 406. When housing 102 is thus secured to junction box 402, flange portion 116 is flush against the surface of ceiling 404, and flange portion 116 (as well as lens 108) is the only portion of the luminaire 100 that extends outward from the surface of ceiling 404. According to aspects, flange portion 116 is thin, for example less than an inch, such that luminaire 100 does not visibly appear to protrude substantially from the surface of ceiling 404. such that luminaire 100 does not visibly appear to protrude substantially from the surface of ceiling 404

In implementations, junction box 402 may be made of galvanized steel, injection molded plastic, aluminum or ceramic. Junction box 402 may be fire-resistant in that it has a fire rating of up to two hours without any need for modification, where the fire rating is described in the National Electrical Code (NEC) and by the Underwriters Laboratories (UL) such as specified in UL 263 Standard for Fire Tests of Building Construction and Materials. In other implementations, luminaire 100 may be attached to a standard 4×4 electrical junction box, which may or may not be fire rated.

FIG. 4B shows how adapter bracket 114 and adapter ring 416 are coupled together in a twist and lock fashion, thus allowing luminaire 100 to be easily mounted to junction box 402. As shown, slot portions 420 of structures on adapter ring 416 are dimensioned to receive corresponding structures on adapter bracket 114, which structures are then fixedly coupled to adapter ring 416 when the adapter 114 and adapter ring 416 are twisted clockwise with respect to each other. Example twist and lock mechanisms that are suitable for practice with the present implementations include those described in U.S. Patent Publ. No. 2016/0348860. By virtue of such mechanisms, luminaire 100 may be easily mounted, accessed, serviced, tested and possibly replaced from below ceiling 404.

FIG. 5 is an assembly drawing of another example luminaire 500 according to implementations.

As shown in this example, luminaire 500 includes many of the same components as luminaire 100, and so repeated descriptions thereof are not included here. Meanwhile, luminaire 500 further includes test button 502 and button housing 504. The button housing 504 in this example is mounted to the external surface of flange portion 116 of housing 102 via clip 120 and screws 506. Test button 502 can be attached to an electrical wire (not shown) and electrical signal source and can include any electrical and mechanical components so that, when test button 502 is depressed, an electrical signal is provided on the attached electrical wire. Many possible examples of such components are known to those skilled in the art, so further details thereof will be omitted here for sake of clarity of the invention.

FIG. 6 illustrates example emergency aspects of luminaire 500. In this example, luminaire 500 is attached to a junction box 402 behind a ceiling 404 as described above in connection with FIGS. 4A and 4B. As such, when luminaire 500 is so attached, button 502, by virtue of being attached to flange portion 116 of housing 102, is accessible from below ceiling 404. As further illustrated, when button 502 is pressed, an electrical signal is sent to power switch 602, which causes power to the luminaire 500 (e.g. via one or more wires 630) to be switched from regular power source 604 to an emergency power source 606. For example, regular power source 604 can be an electrical power wiring network of the building or structure in which the luminaire 500 is installed. In these and other implementations, emergency power source 606 can be a backup power supply including one or more batteries and power conditioning electronics. If the emergency power source 606 is sufficient, light from luminaire 500 will be produced, thereby allowing personnel to verify emergency power source 606 without having to remove luminaire 500 or otherwise gain direct access to emergency power source 600.

It should be noted that the arrangement of elements 602, 604 and 606 with respect to junction box 402 and luminaire 500 shown in FIG. 6 is for illustration purposes only and non-limiting to the present implementations. Many other arrangements are possible, as will be appreciated by those skilled in the art.

FIG. 7 is an assembly drawing of another example luminaire 700 according to some implementations pursuant to the concepts disclosed herein.

As shown in this example, luminaire 700 includes some of the same components as luminaire 100, and so repeated descriptions thereof are not included here. Meanwhile, differently from luminaire 100, luminaire 700 includes driver module cover 704 which can house a driver such as module 104 described above (although a driver 104 is not explicitly shown in FIG. 7, it should be appreciated that a driver may be included in some implementations based on FIG. 7, as discussed elsewhere herein in connection with other figures). not shown). A light source housing 708, similar in some respects to the flange portion 116 of the housing 102 shown in FIG. 1, houses an LED board 710 and lens 712, which are mounted in housing 708 using screws 714 and friction fit clips 716, respectively. Light source housing 708 is further attached to driver module cover 704 using screws 702.

Driver module cover 704 and/or light source housing 708 according to implementations may be made of thermally conducting material, for example plastic comprising materials selected from a group consisting of semi-crystalline polyamides, polyamide alloys, polymers, minerals, glass, and carbon, or other materials such as carbon fiber, aluminum, steel, etc. In these and other implementations, insulator 704 and/or housing 708 may be formed by injection molding, extrusion or other means and dimensioned in accordance with driver 104 and LED board 710, respectively. It should be noted that although light source housing 708 is shown as having a round shape in this example, that this is not limiting, and many other shapes are possible such as squares, rectangles, ovals, etc. (e.g., as discussed further below in connection with FIGS. 8B, 12A and 12B)).

LED board 710 comprises a plurality of LEDs and an example will be described in more detail below. Lens 712 may be made of any optically transmissive material, including glass and hard plastics. For example, lens 712 may be comprised of polycarbonate material, such as Covestro Makrolon® (e.g., see www.plastics.covestro.com/en/Products/Makrolon). In implementations, lens 712 causes light from LEDs on LED board 710 to be distributed evenly across its downward facing surface by at least one of two approaches. In a first approach, the spacing of the LEDs is controlled so as to cause the resulting light to be uniform. In a second approach, lens 712 is formed using a plastic that includes additives that result in a milky white diffusive polymer.

More generally, in one implementation based on FIG. 7 (as well as features from other figures described herein), an LED lighting apparatus 700 comprises a housing 708, an LED board 710 coupled to the housing, and a lens 712 coupled to the housing. The lens has a back side 712B facing the LED board, a front side 712F opposite to the back side, and an outer edge 712E. The front side 712F of the lens provides a downward facing surface when the LED lighting apparatus is installed in an opening of a ceiling, and the lens is disposed with respect to the LED board such that multiple LEDs disposed on the LED board illuminate the back side of the lens.

With reference for the moment to FIG. 9B, which shows a bottom or down-facing perspective view of the lighting apparatus 700 of FIG. 7 as it is installed in a junction box 902, the housing 708 of the lighting apparatus 700 comprises a sidewall 718 having a front facing edge 720 and a back facing edge 722 positioned adjacent to a ceiling when the LED lighting apparatus is installed in an opening of the ceiling. In one example implementation, a depth 724 of the sidewall 718, between the front facing edge 720 and the back facing edge 722, is less than one inch such that the apparatus does not visibly appear to protrude substantially from a surface of the ceiling when the apparatus is installed in an opening of the ceiling. In one aspect, the front side 712F of the lens, providing the downward facing surface when the LED lighting apparatus is installed in the opening in the ceiling, is essentially flush with the front facing edge 720 of the sidewall 718 of the housing 708. In another aspect, the front facing edge 720 of the sidewall 718 forms a perimeter around the outer edge 712E of the lens, wherein the perimeter around the outer edge of the lens is significantly thin so as not to extend significantly beyond the outer edge of the lens. In the foregoing manners, the lighting apparatus 700 has an appreciably thin profile (e.g., installed depth from the ceiling of less than one inch, and significantly thin perimeter around the outer edge of the lens) to provide an aesthetically pleasing architectural lighting component.

FIG. 9C is a partial side cross-sectional view of the luminaire of FIGS. 7 and 9B, illustrating an arrangement of the LED board 710 and the lens 712 disposed in the housing 708, and example dimensions relating to same, according to some inventive implementations. As shown in FIG. 9C, the outer edge 712E of the lens 712, when installed in the housing 708, is disposed in a rabbet 719 of the sidewall 718 of the housing that runs along the front facing edge 720 of the sidewall 718, such that an edge thickness 726 of the front facing edge 720 is smaller than a sidewall thickness 727 of the sidewall 718. In various examples, sidewall 718 may have a thickness 727 of less than 10 millimeters, in some examples less than 5 millimeters, and in other examples less than 3 millimeters. In other examples the front facing edge 720, forming the perimeter around the outer edge of the lens, may have a thickness 726 of less than two millimeters, and in some examples less than 1.5 millimeters. In one specific implementation, the thickness 726 is 1.2 millimeters and the thickness 727 is 2.1 millimeters.

As also shown in FIG. 9C, the housing 708 has a depth 724 between the front facing edge 720 and the back facing edge 722 of the sidewall 718, which in some inventive implementations is less than one inch, as discussed above. In another aspect, a lens thickness 736 of the lens 712 may be on the order of approximately 3 millimeters. In some implementations, a spacing 732 between the LED board 710 and the lens 712 may be particularly selected to cause the resulting light 750 from the downward facing surface of the lens (e.g., see FIG. 7) to be substantially uniform during operation of the apparatus. In yet another aspect, this spacing 732 may be approximately or equal to 8 millimeters.

FIG. 8A illustrates an example circular LED board 710 that can be included in a luminaire such as that illustrated in FIG. 7 according to some inventive implementations, and FIG. 8B illustrates an example rectangular LED board 710B that can be included in a luminaire according to other inventive implementations (e.g., as discussed further below in connection with FIGS. 12A and 12B). As a general premise for both of the LED boards shown respectively in FIGS. 8A and 8B, a spacing of the multiple LEDs 802 on the LED board causes the resulting light 750 from the downward facing surface of the lens (see FIG. 7) to be substantially uniform during operation of the apparatus. In another aspect, both the spacing of the LEDs 802 on the LED board, and the spacing 732 between the LED board 710 and the lens 712, contribute toward a substantially uniform distribution of the resulting light from the downward facing surface of the lens. In yet another aspect, the spacing of the LEDs 802 on the LED board, the spacing 732 between the LED board 710 and the lens 712, and the thickness 736 of the lens respectively contribute toward a substantially uniform distribution of the resulting light. In yet another aspect, the spacing of the LEDs on the LED board, the spacing 732 between the LED board 710 and the lens 712, the thickness 736 of the lens, and the type of material used in the lens (e.g., a milky white polycarbonate) respectively contribute toward a substantially uniform distribution of the resulting light.

In some inventive implementations, the LEDs are distributed uniformly on the LED board and spaced apart almost identically. With reference to FIG. 8A, the plurality of LEDs 802 are arranged on the LED board 710 as a plurality of concentric rings 804. In one aspect, a distance 806 between any two adjacent concentric rings of the plurality of concentric rings is the same or approximately the same. As shown in FIG. 8A, at least a first ring 804A of the plurality of concentric rings comprises a first group 802A of the plurality of LEDs, and respective LEDs of the first group are spaced substantially evenly around the first ring 804A. In some examples (e.g., as shown in FIG. 8A) each ring of the plurality of concentric rings may comprise a different group of the plurality of LEDs, and respective LEDs of each different group are spaced substantially evenly around a corresponding ring of the plurality of concentric rings. In one example, an LED-to-LED spacing of the plurality of LEDs on the LED board is in a range of from approximately 7.5 millimeters to 8.5 millimeters. In another example, a circular LED board 710 has a total of 165 LEDs 802.

With reference to FIG. 8B, the plurality of LEDs 802 on the rectangular LED board 710B are arranged substantially uniformly across an entire surface or substantially the entire surface of the LED board. In one example, an LED-to-LED distance between neighboring LEDs of the plurality of LEDs is in a range of from approximately 7.5 millimeters to 8.5 millimeters; in one example, a horizontal distance 844 between horizontally neighboring LEDS is 7.5 millimeters, and a vertical distance 842 between vertically neighboring LEDS is 8.1 millimeters. As also shown in FIG. 8B, the LED board 710B may also include one or more electrical traces terminating in electrical pads 850, which may be used, for example, in connection with the test button embodiments discussed above in connection with FIGS. 5 and 6, and discussed further below in connection with FIGS. 11A-E.

It should be noted that the number and spacing of LEDs 802 on the circular or rectangular LED boards shown in FIGS. 8A and 8B can depend on factors such as the amount of lumens produced by the LEDs, the type of lens 712, the desired overall light intensity of luminaire 700, etc. In other implementations, an excessive amount of lumens than necessary is produced by the LEDs. Each of LEDs 802 can be implemented by, for example an XLamp LED from Cree, OLEDs, or PLEDs.

FIGS. 9A and 9B illustrate aspects of how easily luminaire 700 according to implementations can be installed in an opening of a ceiling, for example.

As shown in FIG. 9A, first adapter ring 114 is attached to a junction box 902 using screws 904. The adapter ring 114 may include one or more cutouts 906 to facilitate coupling of the luminaire/lighting apparatus to the adapter ring, as discussed below in connection with FIG. 9B. The junction box 902 can be already installed above an opening in the ceiling. Although a standard 4×4 junction box is shown in FIG. 9A, it should be apparent that many other types of junction boxes can be used, such as a type of junction box similar to junction box 402 described above.

Next as shown in FIG. 9B, operating power can be connected to luminaire 700 using wires and connectors in the junction box 902 (not shown). Then luminaire 700 can be snapped into adapter ring 114 and held into place by friction fit clips 706. In one example, the friction fit clips 706 snap fit into the one or more cutouts 906 off the adapter ring 114. It should be noted that junction box 902 is preferably installed and positioned above the ceiling line such that, when luminaire 700 is snapped in place as described herein, light source housing 708 of luminaire 700 appears to be surface mounted to the ceiling, although luminaire 700 is actually held in place by clips 706 and adapter ring 114. Many other alternatives to friction fit clips are possible, such as spring clips, magnets, etc.

FIG. 10A is a side view of a luminaire similar to that shown in FIG. 7, according to some inventive implementations. The luminaire 700A is substantially similar in multiple respects to the luminaire described above in connection with FIGS. 7 through 9. In one different aspect, the driver module cover 704 may include multiple fins 740 which, in some implementations, may facilitate heat dissipation from the luminaire. As shown in FIG. 10A, a ground wire 730 may be coupled to one or both of the housing 708 or the adapter ring 714, and operating power may be coupled to the luminaire via wires 735, to provide for a substantially uniform distribution of resulting light 750 from the luminaire during operation. FIG. 10B is a front view (or downward facing view) of the luminaire shown in FIG. 10A, showing the appreciably thin perimeter formed by the front facing edge 720 of the sidewall 718 of the housing (e.g., having a thickness 726 on the order of less than 10 millimeters, or less than five millimeters, or less than three millimeters, or less than two millimeters, or less than 1.5 millimeters). FIG. 10C is a back view (or upward facing view) of the luminaire shown in FIG. 10A, while FIG. 10D is a back (or top) perspective view of the luminaire shown in FIG. 10A and FIG. 10E is a front (or bottom) exploded perspective view of the luminaire shown in FIG. 10A.

It should be noted that other implementations of luminaire 700 can include a test button such as described above in connection with FIGS. 5 and 6, for example attached to light source housing 708 and connected to electrical wires as described above. In particular, the luminaire may comprise a test button, coupled to the at least one sidewall of the housing and at least one electrical wire, to provide an electrical signal on the at least one electrical wire upon activation of the test button. To this end, FIG. 11A is a side view of a luminaire similar to that shown in FIG. 7, according to some inventive implementations, which includes a test button similar to that shown in FIG. 5. FIG. 11B is a front view (or downward facing view) of the luminaire shown in FIG. 11A, FIG. 11C is a back view (or upward facing view) of the luminaire shown in FIG. 11A, FIG. 11D is a back (or top) perspective view of the luminaire shown in FIG. 11A, and FIG. 11E is a front (or bottom) exploded perspective view of the luminaire shown in FIG. 11A.

FIG. 12A is a front (or bottom) side perspective view of a rectangular-shaped luminaire 700C according to some inventive implementations, and FIG. 12B is a back (or top) side perspective view of the luminaire of FIG. 12A according to some inventive implementations. The luminaire shown in FIGS. 12A and 12B may employ the rectangular LED board 710B as shown and discussed above in connection with FIG. 8B. In other aspects, the luminaire 700C may share one or more features or attributes as discussed above in connection with the circular luminaires; for example, the housing 708C of the luminaire may have a depth 724 of sidewalls 718 on the order of less than one inch, and a perimeter thickness 726 of the front facing edge 720 of the housing sidewalls, constituting a perimeter around the front face 712F of the lens 112, may be on the order of less than 10 millimeters, or less than 5 millimeters, or less than 3 millimeters, or less than 2 millimeters, or less than 1.5 millimeters.

Although the present implementations have been particularly described with reference to preferred ones thereof, it should be readily apparent to those of ordinary skill in the art that changes and modifications in the form and details may be made without departing from the spirit and scope of the present disclosure. It is intended that the appended claims encompass such changes and modifications.

CONCLUSION

Those skilled in the relevant arts will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations may depend upon the specific application or applications for which the inventive teachings is/are used. It is to be understood that the foregoing implementations are presented primarily by way of example and that, within the scope of the appended claims and equivalents thereto, inventive implementations may be practiced otherwise than as specifically described and claimed. Inventive implementations of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the inventive scope of the present disclosure.

Also, the technology described herein may be embodied as a method. The acts performed as part of the method may be ordered in any suitable way. Accordingly, implementations may be constructed in which acts are performed in an order different than illustrated, which may include performing some acts simultaneously, even though shown as sequential acts in illustrative implementations.

All definitions, as defined and used herein, should be understood to control over dictionary definitions, definitions in documents incorporated by reference, and/or ordinary meanings of the defined terms.

The indefinite articles “a” and “an,” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to mean “at least one.”

The phrase “and/or,” as used herein in the specification and in the claims, should be understood to mean “either or both” of the elements so conjoined, i.e., elements that are conjunctively present in some cases and disjunctively present in other cases. Multiple elements listed with “and/or” should be construed in the same fashion, i.e., “one or more” of the elements so conjoined. Other elements may optionally be present other than the elements specifically identified by the “and/or” clause, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, a reference to “A and/or B”, when used in conjunction with open-ended language such as “comprising” can refer, in one embodiment, to A only (optionally including elements other than B); in another embodiment, to B only (optionally including elements other than A); in yet another embodiment, to both A and B (optionally including other elements); etc.

As used herein in the specification and in the claims, “or” should be understood to have the same meaning as “and/or” as defined above. For example, when separating items in a list, “or” or “and/or” shall be interpreted as being inclusive, i.e., the inclusion of at least one, but also including more than one, of a number or list of elements, and, optionally, additional unlisted items. Only terms clearly indicated to the contrary, such as “only one of” or “exactly one of,” or, when used in the claims, “consisting of,” will refer to the inclusion of exactly one element of a number or list of elements. In general, the term “or” as used herein shall only be interpreted as indicating exclusive alternatives (i.e. “one or the other but not both”) when preceded by terms of exclusivity, such as “either,” “one of,” “only one of,” or “exactly one of.” “Consisting essentially of,” when used in the claims, shall have its ordinary meaning as used in the field of patent law.

As used herein in the specification and in the claims, the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements. This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, “at least one of A and B” (or, equivalently, “at least one of A or B,” or, equivalently “at least one of A and/or B”) can refer, in one embodiment, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another embodiment, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another embodiment, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc.

In the claims, as well as in the specification above, all transitional phrases such as “comprising,” “including,” “carrying,” “having,” “containing,” “involving,” “holding,” “composed of,” and the like are to be understood to be open-ended, i.e., to mean including but not limited to. Only the transitional phrases “consisting of” and “consisting essentially of” shall be closed or semi-closed transitional phrases, respectively, as set forth in the United States Patent Office Manual of Patent Examining Procedures, Section 2111.03. 

The invention claimed is:
 1. An LED downlighting apparatus, comprising: a housing comprising at least one sidewall having a front facing edge and a back facing edge positioned adjacent to a ceiling when the LED downlighting apparatus is installed in an opening of the ceiling, wherein: a depth of the at least one sidewall of the housing, between the front facing edge and the back facing edge, is less than one inch; and a thickness of at least a portion of the at least one sidewall is less than three millimeters; an LED board coupled to the housing, the LED board comprising a plurality of LEDs; a lens coupled to the housing, the lens having a back side facing the LED board and a front side opposite to the back side, the lens being disposed with respect to the LED board such that the plurality of the LEDs illuminate the back side of the lens; and at least one mechanical coupler to snap fit the apparatus to a junction box installed and positioned above the ceiling such that when the apparatus is snap fit to the junction box through the opening of the ceiling, the housing appears to be surface mounted to the ceiling.
 2. The apparatus of claim 1, wherein: an edge thickness of the front facing edge of the at least one sidewall is less than 1.5 millimeters.
 3. The apparatus of claim 1, wherein the lens is substantially flat or flat.
 4. The apparatus of claim 1, wherein: the LED board has a first dimension in a first plane parallel to the back side of the lens; the lens has a second dimension in a second plane corresponding to the back side of the lens; and the first dimension of the LED board and the second dimension of the lens are substantially the same or the same.
 5. The apparatus of claim 1, wherein the quotient of: an LED-to-LED spacing of adjacent LEDs of the plurality of LEDs on the LED board; and a spacing between the LED board and the lens, is in a range of from 7.5/8 to 8.5/8.
 6. The apparatus of claim 1, wherein the plurality of LEDs are distributed uniformly on the LED board and spaced apart almost identically or identically.
 7. The apparatus of claim 6, wherein an LED-to-LED spacing of adjacent LEDs of the plurality of LEDs on the LED board is in a range of from approximately 7.5 millimeters to 8.5 millimeters.
 8. The apparatus of claim 6, wherein a spacing between the LED board and the lens is approximately or equal to eight millimeters.
 9. The apparatus of claim 6, wherein: the LED board is circular; and the plurality of LEDs is arranged on the LED board as a plurality of concentric rings.
 10. The apparatus of claim 9, wherein a distance between any two adjacent concentric rings of the plurality of concentric rings is the same or approximately the same.
 11. The apparatus of claim 9, wherein: at least a first ring of the plurality of concentric rings comprises a first group of the plurality of LEDs; and respective LEDs of the first group are spaced substantially evenly around the first ring of the plurality of concentric rings.
 12. The apparatus of claim 11, wherein: each ring of the plurality of concentric rings comprises a different group of the plurality of LEDs; and respective LEDs of each different group are spaced substantially evenly around a corresponding ring of the plurality of concentric rings.
 13. The apparatus of claim 6, wherein: the LED board is rectangular; and the plurality of LEDs is arranged substantially uniformly across an entire surface or substantially the entire surface of the LED board.
 14. The apparatus of claim 13, wherein an LED-to-LED distance between neighboring LEDs of the plurality of LEDs is in a range of from approximately 7.5 millimeters to 8.5 millimeters.
 15. The apparatus of claim 1, wherein the front side of the lens is essentially flush with the front facing edge of the at least one sidewall of the housing.
 16. The apparatus of claim 1, wherein the at least one sidewall of the housing is substantially perpendicular or perpendicular to the lens.
 17. An LED downlighting apparatus, comprising: a housing comprising at least one sidewall having a front facing edge and a back facing edge positioned adjacent to a ceiling when the LED downlighting apparatus is installed in an opening of the ceiling, wherein a thickness of at least a portion of the at least one sidewall is less than three millimeters; an LED board coupled to the housing, the LED board comprising a plurality of LEDs; a lens coupled to the housing, the lens having a back side facing the LED board and a front side opposite to the back side, the lens being disposed with respect to the LED board such that the plurality of the LEDs illuminate the back side of the lens; and at least one screwless mechanical coupler to couple the apparatus to the ceiling.
 18. The apparatus of claim 17, wherein the at least one screwless mechanical coupler comprises at least one snap fit coupler.
 19. The apparatus of claim 17, wherein the at least one screwless mechanical coupler comprises at least one of a friction fit clip, a spring clip, or a magnet.
 20. An assembly, comprising: the apparatus of claim 17; and an adapter ring to couple the apparatus to a junction box, wherein the apparatus is coupled to the adapter ring via the at least one screwless mechanical coupler. 